Soil-mediated eco-evolutionary feedbacks in the invasive plant Alliaria petiolata

Jeffrey A. Evans, Richard A. Lankau, Adam S. Davis, S. Raghu, Douglas A. Landis

Research output: Contribution to journalArticlepeer-review

Abstract

Ecological and evolutionary processes historically have been assumed to operate on significantly different time-scales. We know now from theory and work in experimental and model systems that these processes can feed back on each other on mutually relevant time-scales. Here, we present evidence of a soil-mediated eco-evolutionary feedback on the population dynamics of an invasive biennial plant, Alliaria petiolata. As populations age, natural selection drives down production of A. petiolata's important antimycorrhizal allelochemical, sinigrin. This occurs due to density-dependent selection on sinigrin, which is favoured under interspecific, but disfavoured under intraspecific, competition. We show that population stochastic growth rates (λS) and plant densities are positively related to sinigrin concentration measured in seedling roots. This interaction is mediated by sinigrin's positive effect on seedling and summer survival, which are important drivers of λS. Together, these illustrate how the evolution of a trait shaped by natural selection can influence the ecology of a species over a period of just years to decades, altering its trajectory of population growth and interactions with the species in the soil and plant communities it invades. Our findings confirm the predictions that eco-evolutionary feedbacks occur in natural populations. Furthermore, they improve our conceptual framework for projecting future population growth by linking the variation in plant demography to a critical competitive trait (sinigrin) whose selective advantages decrease as populations age.

Original languageEnglish (US)
Pages (from-to)1053-1061
Number of pages9
JournalFunctional Ecology
Volume30
Issue number7
DOIs
StatePublished - Jul 1 2016

Keywords

  • Alliaria petiolata
  • eco-evolutionary
  • eco-evolutionary feedbacks
  • ecology
  • evolution
  • reciprocal feedbacks
  • sinigrin
  • soil root feedback

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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